Microsoft Excel applies a default thin line style when you add an outer cell border or gridlines.
To change the width of a cell border, follow these steps:
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Select one or more cells that have a border that you want to change.
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Right-click over the cells you've chosen and select Format Cells and, in the popup window, click the Border tab.
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For a continuous line, choose one of the thicker styles from the Line box.
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In the Presets section, click your existing border type.
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Check your new border width in the preview diagram. If it's not the way you want it to appear, click another Line style.
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Click OK.
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